Assuming you've not made the mistake of installing Raspbian Lite the next command should besudo raspi-config
From the menu choose3 Boot Options Configure options for start-up
ThenB1 Desktop / CLI Choose whether to boot into a des
ThenB4 Desktop Autologin Desktop GUI, automatically logged in as '' user

That will get you to a desktop on reboot.

If you've installed Raspbian Lite you either need to start again with full-fat Raspbian or you'd need to install the raspberrypi-ui-mods to get the desktop stuff available. Then after a reboot follow the process I've given you above.

Note: Having anything humorous in your signature is completely banned on this forum. Wear a tin-foil hat and you'll get a ban.

I was going to install Raspbian stretch lite on my Pi 3 but at the bios screen after I entered my username and password what is the next command that I enter?

The "Lite" version of Raspbian has no Desktop/GUI. It is command line only (you type commands you want the OS to execute or run). What you see on the screen IS the Raspbian Stretch Lite OS.

The first command to run in Raspbian Lite is usually sudo raspi-config to complete your system setup (change password and hostname, configure localisations, turn various interfaces on/off, etc.). From there you just do whatever you need.

If you want the Desktop graphical user interface, you should probably start over with the full Raspbian Stretch with Desktop, but you could also just install a desktop on Lite (sudo apt update && sudo apt install raspberrypi-ui-mods for the default Raspberry Pi Desktop GUI).

My mind is like a browser. 27 tabs are open, 9 aren't responding,
lots of pop-ups...and where is that annoying music coming from?

That caught me by surprise too when I installed Raspbian Stretch Lite.... thinking it was a "lighter" version of the desktop (just boot to minimal desktop environment, apps/packages to be added later by user)

then I checked again the documentation.... re-flashed the microSD with the desktop version instead....end of problem....

"Don't come to me with 'issues' for I don't know how to deal with those
Come to me with 'problems' and I'll help you find solutions"Some people be like:
"Help me! Am drowning! But dont you dare touch me nor come near me!"